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rtnl/ipv4: add support of RTM_GETNETCONF 

This message allows to get the devconf for an interface.

Signed-off-by: Nicolas Dichtel <nicolas.dichtel@6wind.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Nicolas Dichtel 2012-10-25 22:28:53 +00:00 committed by David S. Miller
parent edc9e74893
commit 9e5511106f
1 changed files with 73 additions and 2 deletions
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75
net/ipv4/devinet.c
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@ -1448,7 +1448,8 @@ static int inet_netconf_msgsize_devconf(int type)
int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
+ nla_total_size(4); /* NETCONFA_IFINDEX */
if (type == NETCONFA_FORWARDING)
/* type -1 is used for ALL */
if (type == -1 || type == NETCONFA_FORWARDING)
size += nla_total_size(4);
return size;
@ -1473,7 +1474,8 @@ static int inet_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
goto nla_put_failure;
if (type == NETCONFA_FORWARDING &&
/* type -1 is used for ALL */
if ((type == -1 || type == NETCONFA_FORWARDING) &&
nla_put_s32(skb, NETCONFA_FORWARDING,
IPV4_DEVCONF(*devconf, FORWARDING)) < 0)
goto nla_put_failure;
@ -1510,6 +1512,73 @@ errout:
rtnl_set_sk_err(net, RTNLGRP_IPV4_NETCONF, err);
}
static const struct nla_policy devconf_ipv4_policy[NETCONFA_MAX+1] = {
[NETCONFA_IFINDEX] = { .len = sizeof(int) },
[NETCONFA_FORWARDING] = { .len = sizeof(int) },
};
static int inet_netconf_get_devconf(struct sk_buff *in_skb,
struct nlmsghdr *nlh,
void *arg)
{
struct net *net = sock_net(in_skb->sk);
struct nlattr *tb[NETCONFA_MAX+1];
struct netconfmsg *ncm;
struct sk_buff *skb;
struct ipv4_devconf *devconf;
struct in_device *in_dev;
struct net_device *dev;
int ifindex;
int err;
err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX,
devconf_ipv4_policy);
if (err < 0)
goto errout;
err = EINVAL;
if (!tb[NETCONFA_IFINDEX])
goto errout;
ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
switch (ifindex) {
case NETCONFA_IFINDEX_ALL:
devconf = net->ipv4.devconf_all;
break;
case NETCONFA_IFINDEX_DEFAULT:
devconf = net->ipv4.devconf_dflt;
break;
default:
dev = __dev_get_by_index(net, ifindex);
if (dev == NULL)
goto errout;
in_dev = __in_dev_get_rtnl(dev);
if (in_dev == NULL)
goto errout;
devconf = &in_dev->cnf;
break;
}
err = -ENOBUFS;
skb = nlmsg_new(inet_netconf_msgsize_devconf(-1), GFP_ATOMIC);
if (skb == NULL)
goto errout;
err = inet_netconf_fill_devconf(skb, ifindex, devconf,
NETLINK_CB(in_skb).portid,
nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
-1);
if (err < 0) {
/* -EMSGSIZE implies BUG in inet_netconf_msgsize_devconf() */
WARN_ON(err == -EMSGSIZE);
kfree_skb(skb);
goto errout;
}
err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
errout:
return err;
}
#ifdef CONFIG_SYSCTL
static void devinet_copy_dflt_conf(struct net *net, int i)
@ -1894,5 +1963,7 @@ void __init devinet_init(void)
rtnl_register(PF_INET, RTM_NEWADDR, inet_rtm_newaddr, NULL, NULL);
rtnl_register(PF_INET, RTM_DELADDR, inet_rtm_deladdr, NULL, NULL);
rtnl_register(PF_INET, RTM_GETADDR, NULL, inet_dump_ifaddr, NULL);
rtnl_register(PF_INET, RTM_GETNETCONF, inet_netconf_get_devconf,
NULL, NULL);
}